FELTON -- Two cases of highly contagious measles have been confirmed in San Lorenzo Valley by lab tests, and the county health services agency warns anyone who shopped at New Leaf Market or Liberty Bank in Felton on Jan. 26, 27 or 28 may be at risk for the disease.

Health services agency spokeswoman Laurie Lang said the first confirmed case was isolated Jan. 19. The second was isolated at home Jan. 30, but remains infectious through Feb. 3.

The Communicable Disease Unit of the Public Health Department is investigating to identify close contacts to the cases. Measles can cause complications such as pneumonia, encephalitis, ear infection and diarrhea.

"One of our employees was confirmed to have measles," said Nellie Donovan, New Leaf Felton general manager, noting the individual works in the office, not a cashier or someone handling food. "It was an extremely mild case."

Employees at New Leaf were required to produced immunization records, and those who didn't had blood drawn Friday to check.

"They're taking all the precautions," Donovan said.

The health department advises anyone who shopped at New Leaf on the days at issue to ask themselves:

Did you receive at least one dose of measles vaccine in the past?

Were you born before 1957?

Have you had a blood test showing you are immune to measles?

Were you in the Armed Forces?

Did you have measles in the past?

If you answer yes to any of these questions, you likely are protected from measles but may want to consider a second dose of vaccine.

If you answer no to all of the questions, you are at risk for measles, according to the health agency, which recommends you get a vaccine and watch for symptoms from Saturday until Feb. 24.

Pregnant women and those who are immune-compromised are advised to call their health provider to report the exposure. To prevent measles from spreading, do not sit in the patient waiting room, the health department advised.